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Journal of Analytical Chemistry

, Volume 56, Issue 4, pp 341–347 | Cite as

Regularities in the Sorption Recovery of Osmium in Various Oxidation States (VIII, VI, and IV) on Silica Chemically Modified with Thiourea Derivatives

  • V. N. Losev
  • M. P. Bakhtina
  • I. P. Bakhvalova
  • A. K. Trofimchuk
  • V. K. Runov
Article

Abstract

Regularities in the sorption recovery of osmium(VIII, VI, IV) on silica chemically modified with thiourea derivatives (N-allyl-N"-propylthiourea (ATUS), N-phenyl-N"-propylthiourea (PTUS), and N-benzoyl-N"-propylthiourea (BTUS)) were studied. The equilibrium attainment time for the solid-phase extraction of osmium(VIII) is 15, 30, and 40 min for ATUS, PTUS, and BTUS, respectively. For the solid-phase extraction of osmium(VI), equilibrium attainment time is independent of the type of the sorbent and is no more than 5 min. The recovery of osmium(IV) at 95°C and equilibration time 120 min is no higher than 5%. The quantitative recovery of osmium(IV) with silica chemically modified with thiourea derivatives is attained on long-term heating and in the presence of tin(II) chloride. Based on the regularities in the sorption recovery of osmium in different oxidation states and its interaction with thiourea in aqueous solutions with low mole ratios, it was suggested that osmium(VIII, VI) and osmium(IV) interact with thiourea and its derivatives including those covalently bonded to the silica surface via different mechanisms.

Keywords

Oxidation Chloride Aqueous Solution Analytical Chemistry Oxidation State 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© MAIK “Nauka/Interperiodica” 2001

Authors and Affiliations

  • V. N. Losev
    • 1
  • M. P. Bakhtina
    • 1
  • I. P. Bakhvalova
    • 1
  • A. K. Trofimchuk
    • 2
  • V. K. Runov
    • 3
  1. 1.Research Engineering Center KristallKrasnoyarskRussia
  2. 2.Department of ChemistryShevchenko National UniversityKievUkraine
  3. 3.Department of ChemistryMoscow State UniversityVorob'evy gory, MoscowRussia

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